NEWS

This file describes changes in recent versions of Slurm. It primarily
documents those changes that are of interest to users and administrators.

* Changes in Slurm 19.05.0pre2
==============================
 -- Removed select/serial plugin.
 -- Remove 512-character line length limit in slurm_print_topo_record().
    (Used by "scontrol show topology".)
 -- Removed crypto/openssl plugin.
 -- Tweak the sdiag gettimeofday() line format for greater clarity.
 -- Add support for SALLOC/SBATCH/SLURM_NO_KILL environment variables.
    Add salloc/sbatch/srun support for optional "--no-kill=off" option to
    disable the environment variables.
 -- Fix salloc and missing SLURM_NTASKS.
 -- Alter the backfill scheduler behavior to prevent it from scheduling lower
    priority jobs on resources that become available during the backfill
    scheduling cycle when bf_continue is enabled. This behavior was available
    as the bf_ignore_newly_avail_nodes option in 18.08.4+, but is now enabled
    by default. (The SchedulerParameters option of bf_ignore_newly_avail_nodes
    is also now removed, although harmless if still set.)
 -- Make LaunchParameters=send_gids the default introducing the reverse option
    "disable_send_gids to go back to the original behavior.
 -- Limit pam_slurm_adopt to run only in the sshd context by default, for
    security reasons. A new module option 'service=<name>' can be used to
    allow a different PAM applications to work. The option 'service=*' can be
    used to restore the old behavior of always performing the adopt logic
    regardless of the PAM application context.
 -- pam_slurm_adopt: Use uid to determine whether root is logging.
 -- Remove sbatch --x11 option. Slurm's internal X11 forwarding is now only
    supported from salloc, or an allocating srun command.
 -- Suppressed printing of job id in sbatch when quiet flag is set.
 -- Changed sreport 'SizesByAccount' and 'SizesByAccountAndWckey' default
    behavior and added new 'AcctAsParent' option.
 -- Add ave watts to api and sview.
 -- Added printf attribute to setenvf() and corrected related warnings.
 -- Kill running/pending job is allocated GRES and that GRES has a "File"
    configuration, and the GRES count changes.
 -- Add new DebugFlag=Accrue for accrue accounting debugging purposes.
 -- Change CryptoType option to CredType, and rename crypto/munge plugin to
    cred/munge.
 -- Add slurmd -G option to print GRES configuration and exit. This is useful
    for testing and debugging.
 -- Support GRES types that include numbers (e.g. "--gres=gpu:123g:2").
 -- Remove MemLimitEnforce parameter and move functionality into
    JobAcctGatherParam=OverMemoryKill.
 -- sview - disable admin mode option (which would not work anyways) if the
    user is not an admin in SlurmDBD.
 -- Remove joules reporting from sview and scontrol.
 -- Change the default fair share algorithm to "fair tree". The new
    PriorityFlags option of NO_FAIR_TREE can be used to revert to "classic"
    fair share scheduling instead.
 -- libslurmdb has been merged into libslurm.
 -- Added -b as a short option for --begin and removed the -b option which
    was a left over artifact from the Moab compatibility work.
 -- Add ArrayTaskThrottle to "scontrol show job" output.
 -- Added SPRIO_FORMAT env variable to the sprio command.
 -- Add batch step at the beginning of a batch job so that squeue, sstat, and
    sacct will show the batch step.
 -- Deprecated 32-bit builds.
 -- Make -l and -o mutually exclusive in saccct, squeue, sinfo, and sprio
 -- Disable running job expansion by default. A new SchedulerParameter of
    permit_job_expansion has been added for sites that wish to re-enable it.
 -- Permit changing a job array's ArrayTaskThrottle value even if the job is
    terminated (for job requeue).
 -- Add scontrol requeue option of "Incomplete" which will requeue jobs only if
    they failed to complete with an exit code of zero.
 -- Modify GrpNodes limit to apply to unique nodes allocated (avoid double
    counting nodes allocated to multiple jobs in the same QOS or association).
 -- If a job submit does NOT include --cpus-per-task option, then report the
    value as "N/A" rather than always mapping the value to 1.

* Changes in Slurm 19.05.0pre1
==============================
 -- Run epilog and clean up allocation when a job is resized to zero and its
    resources transferred to another job (--depend=expand).
 -- If GRES are associated with specific sockets, identify those sockets in the
    output of "scontrol show node". For example if all 4 GPUs on a node are
    all associated with socket zero, then "Gres=gpu:4(S:0)". If associated
    with sockets 0 and 1 then "Gres=gpu:4(S:0-1)". The information of which
    specific GPUs are associated with specific GPUs is not reported, but only
    available by parsing the gres.conf file.
 -- Add configuration parameter "GpuFreqDef" to control a job's default GPU
    frequency.
 -- Add job flags to the database.  Currently used to determine which scheduler
    scheduled the job.
 -- Add constraints/features to the database.
 -- Add last reason job didn't run before resources/priority to the database.
 -- Make it so we set the alloc_node in a resource allocation based on the auth
    plugin instead of the rpc call.

* Changes in Slurm 18.08.6
==========================
 -- Added parsing of -H flag with scancel.
 -- Fix slurmsmwd build on 32-bit systems.
 -- acct_gather_filesystem/lustre - add support for Lustre 2.12 client.
 -- Fix per-partition TRES factors/priority
 -- Fix per-partition NICE priority
 -- Fix partition access check validation for multi-partition job submissions.
 -- Prevent segfault on empty response in 'scontrol show dwstat'.
 -- node_features/knl_cray plugin - Preserve node's active features if it has
    already booted when slurmctld daemon is reconfigured.
 -- Detect missing burst buffer script and reject job.
 -- GRES: Properly reset the topo_gres_cnt_alloc counter on slurmctld restart
    to prevent underflow.
 -- Avoid errors from packing accounting_storage_mysql.so when RPM is built
    with out mysql support.
 -- Remove deprecated -t option from slurmctld --help.
 -- acct_gather_filesystem/lustre - fix stats gathering.
 -- Enforce documented default usage start and end times when querying jobs from
    the database.
 -- Fix issues when querying running jobs from the database.
 -- Deny sacct request where start time is later than the end time requested.
 -- Fix sacct verbose about time and states queried.
 -- burst_buffer/cray - allow 'scancel --hurry <jobid>' to tear down a burst
    buffer that is currently staging data out.
 -- X11 forwarding - allow setup if the DISPLAY environment variable lacks
    a screen number. (Permit both "localhost:10.0" and "localhost:10".)
 -- docs - change HTML title to include the page title or man page name.
 -- X11 forwarding - fix an unnecessary error message when using the
    local_xauthority X11Parameters option.

* Changes in Slurm 18.08.5-2
============================
 -- Fix Perl build for 32-bit systems.

* Changes in Slurm 18.08.5
==========================
 -- Backfill - If a job has a time_limit guess the end time of a job better
    if OverTimeLimit is Unlimited.
 -- Fix "sacctmgr show events event=cluster"
 -- Fix sacctmgr show runawayjobs from sibling cluster
 -- Avoid bit offset of -1 in call to bit_nclear().
 -- Insure that "hbm" is a configured GresType on knl systems.
 -- Fix NodeFeaturesPlugins=node_features/knl_generic to allow other gres
    other than knl.
 -- cons_res: Prevent overflow on multiply.
 -- Better debug for bad values in gres.conf.
 -- Fix double accounting of energy at end of job.
 -- Read gres.conf for cloud nodes on slurmctld.
 -- Don't assume the first node of a job is the batch host when purging jobs
    from a node.
 -- Better debugging when a job doesn't have a job_resrcs ptr.
 -- Store ave watts in energy plugins.
 -- Add XCC plugin for reading Lenovo Power.
 -- Fix minor memory leak when scheduling rebootable nodes.
 -- Fix debug2 prefix for sched log.
 -- Fix printing correct SLURM_JOB_ACCOUNT_PACK_GROUP_* in env for a Het Job.
 -- sbatch - search current working directory first for job script.
 -- Make it so held jobs reset the AccrueTime and do not count against any
    AccrueTime limits.
 -- Add SchedulerParameters option of bf_hetjob_prio=[min|avg|max] to alter the
    job sorting algorithm for scheduling heterogeneous jobs.
 -- Fix initialization of assoc_mgr_locks and slurmctld_locks lock structures.
 -- Fix segfault with job arrays using X11 forwarding.
 -- Revert regression caused by e0ee1c7054 which caused negative values and
    values starting with a decimal to be invalid for PriorityWeightTRES and
    TRESBillingWeight.
 -- Fix possibility to update a job's reservation to none.
 -- Suppress connection errors to primary slurmdbd when backup dbd is active.
 -- Suppress connection errors to primary db when backup db kicks in
 -- Add missing fields for sacct --completion when using jobcomp/filetxt.
 -- Fix incorrect values set for UserCPU, SystemCPU, and TotalCPU sacct fields
    when JobAcctGatherType=jobacct_gather/cgroup.
 -- Fixed srun from double printing invalid option msg twice.
 -- Remove unused -b flag from getopt call in sbatch.
 -- Disable reporting of node TRES in sreport.
 -- Re-enabling features combined by OR within parenthesis for non-knl setups.
 -- Prevent sending duplicate requests to reboot a node before ResumeTimeout.
 -- Down nodes that don't reboot by ResumeTimeout.
 -- Update seff to reflect API change from rss_max to tres_usage_in_max.
 -- Add missing TRES constants from perl API.
 -- Fix issue where sacct would return incorrect array tasks when querying
    specific tasks.
 -- Add missing variables to slurmdb_stats_t in the perlapi.
 -- Fix nodes not getting reboot RPC when job requires reboot of nodes.
 -- Fix failing update the partition list of a job.
 -- Use slurm.conf gres ids instead of gres.conf names to get a gres type name.
 -- Add mitigation for a potential heap overflow on 32-bit systems in xmalloc.
    CVE-2019-6438.

* Changes in Slurm 18.08.4
==========================
 -- burst_buffer/cray - avoid launching a job that would be immediately
    cancelled due to a DataWarp failure.
 -- Fix message sent to user to display preempted instead of time limit when
    a job is preempted.
 -- Fix memory leak when a failure happens processing a nodes gres config.
 -- Improve error message when failures happen processing a nodes gres config.
 -- When building rpms ignore redundant standard rpaths and insecure relative
    rpaths, for RHEL based distros which use "check-rpaths" tool.
 -- Don't skip jobs in scontrol hold.
 -- Avoid locking the job_list when unneeded.
 -- Allow --cpu-bind=verbose to be used with SLURM_HINT environment variable.
 -- Make it so fixing runaway jobs will not alter the same job requeued
    when not runaway.
 -- Avoid checking state when searching for runaway jobs.
 -- Remove redundant check for end time of job when searching for runaway jobs.
 -- Make sure that we properly check for runawayjobs where another job might
    have the same id (for example, if a job was requeued) by also checking the
    submit time.
 -- Add scontrol update job ResetAccrueTime to clear a job's time
    previously accrued for priority.
 -- cons_res: Delay exiting cr_job_test until after cores/cpus are calculated
    and distributed.
 -- Fix bug where binary in cwd would trump binary in PATH with test_exec.
 -- Fix check to test printf("%s\n", NULL); to not require
    -Wno-format-truncation CFLAG.
 -- Fix JobAcctGatherParams=UsePss to report the correct usage.
 -- Fix minor memory leak in pmix plugin.
 -- Fix minor memory leak in slurmctld when reading configuration.
 -- Handle return codes correctly from pthread_* functions.
 -- Fix minor memory leak when a slurmd is unable to contact a slurmctld
    when trying to register.
 -- Fix sreport sizesbyaccount report when using Flatview and accounts.
 -- Fix incorrect shift when dealing with node weights and scheduling.
 -- libslurm/perl - Fix segfault caused by incorrect hv_to_slurm_ctl_conf.
 -- Add qos and assoc options to confirmation dialogs.
 -- Handle updating identical license or partition information correctly.
 -- Makes sure accounts and QOS' are all lower case to match documentation
    when read in from the slurm.conf file.
 -- Don't consider partitions without enough nodes in reservation,
    main scheduler.
 -- Set SLURM_NTASKS correctly if having to determine from other options.
 -- Removed GCP scripts from contribs. Now located at:
    https://github.com/SchedMD/slurm-gcp.
 -- Don't check existence of srun --prolog or --epilog executables when set to
    "none" and SLURM_TEST_EXEC is used.
 -- Add "P" suffix support to job and step tres specifications.
 -- When doing a reconfigure handle QOS' GrpJobsAccrue correctly.
 -- Remove unneeded extra parentheses from sh5util.
 -- Fix jobacct_gather/cgroup to work correctly when more than one task is
    started on a node.
 -- If requesting --ntasks-per-node with no tasks set tasks correctly.
 -- Accept modifiers for TRES originally added in 6f0342e0358.
 -- Don't remove reservation on slurmctld restart if nodes are removed from
    configuration.
 -- Fix bad xfree in task/cgroup.
 -- Fix removing counters if a job array isn't subject to limits and is
    canceled while pending.
 -- Make sure SLURM_NTASKS_PER_NODE is set correctly when env is overwritten
    by the command line.
 -- Clean up step on a failed node correctly.
 -- mpi/pmix: Fixed the logging of collective state.
 -- mpi/pmix: Make multi-slurmd work correctly when using ring communication.
 -- mpi/pmix: Fix double invocation of the PMIx lib fence callback.
 -- mpi/pmix: Remove unneeded libpmix callback drop in tree-based coll.
 -- Fix race condition in route/topology when the slurmctld is reconfigured.
 -- In route/topology validate the slurmctld doesn't try to initialize the
    node system.
 -- Fix issue when requesting invalid gres.
 -- Validate job_ptr in backfill before restoring preempt state.
 -- Fix issue when job's environment is minimal and only contains variables
    Slurm is going to replace internally.
 -- When handling runaway jobs remove all usage before rollup to remove any
    time that wasn't existent instead of just updating lines that have time
    with a lesser time.
 -- salloc - set SLURM_NTASKS_PER_CORE and SLURM_NTASKS_PER_SOCKET in the
    environment if the corresponding command line options are used.
 -- slurmd - fix handling of the -f flag to specify alternate config file
    locations.
 -- Fix scheduling logic to avoid using nodes that require a reboot for KNL
    node change when possible.
 -- Fix scheduling logic bug. There should have been a test for _not_
    NODE_SET_REBOOT to continue.
 -- Fix a scheuling logic bug with respect to XOR operation support when there
    are down nodes.
 -- If there is a constraint construct of the form "[...&...]"
    then an error is generated if more than one of those specifications
    contains KNL NUMA or MCDRAM modes.
 -- Fix stepd segfault race if slurmctld hasn't registered with the launching
    slurmd yet delivering it's TRES list.
 -- Add SchedulerParameters option of bf_ignore_newly_avail_nodes to avoid
    scheduling lower priority jobs on resources that become available during
    the backfill scheduling cycle when bf_continue is enabled.
 -- Decrement message_connections in stepd code on error path correctly.
 -- Decrease an error message to be debug.
 -- Fix missing suffixes in squeue.
 -- pam_slurm_adopt - send an error message to the user if no Slurm jobs
    can be located on the node.
 -- Run SlurmctldPrimaryOffProg when the primary slurmctld process shuts down.
 -- job_submit/lua: Add several slurmctld return codes.
 -- job_submit/lua: Add user/group info to jobs.
 -- Fix formatting issues when printing uint64_t.
 -- Bump RLIMIT_NOFILE for daemons in systemd services.
 -- Expand %x in job name in 'scontrol show job'.
 -- salloc/sbatch/srun - print warning if mutually exclusive options of --mem
    and --mem-per-cpu are both set.

* Changes in Slurm 18.08.3
==========================
 -- Fix regression in 18.08.1 that caused dbd messages to not be queued up
    when the dbd was down.
 -- Fix regression in 18.08.1 that can cause a slurmctld crash when splitting
    job array elements.

* Changes in Slurm 18.08.2
==========================
 -- Correctly initialize variable in env_array_user_default().
 -- Remove race condition when signaling starting step.
 -- Fix issue where 17.11 job's using GRES in didn't initialize new 18.08
    structures after unpack.
 -- Stop removing nodes once the minimum CPU or node count for the job is
    reached in the cons_res plugin.
 -- Process any changes to MinJobAge and SlurmdTimeout in the slurmctld when
    it is reconfigured to determine changes in its background timers.
 -- Use previous SlurmdTimeout in the slurmctld after a reconfigure to
    determine the time a node has been down.
 -- Fix multi-cluster srun between clusters with different SelectType plugins.
 -- Fix removing job licenses on reconfig/restart when configured license
    counts are 0.
 -- If a job requested multiple licenses and one license was removed then on
    a reconfigure/restart all of the licenses -- including the valid ones
    would be removed.
 -- Fix issue where job's license string wasn't updated after a restart when
    licenses were removed or added.
 -- Add allow_zero_lic to SchedulerParameters.
 -- Avoid scheduling tasks in excess of ArrayTaskThrottle when canceling tasks
    of an array.
 -- Fix jobs that request memory per node and task count that can't be
    scheduled right away.
 -- Avoid infinite loop with jobacct_gather/linux when pids wrap around
    /proc/sys/kernel/pid_max.
 -- Fix --parsable2 output for sacct and sstat commands to remove a stray
    trailing delimiter.
 -- When modifying a user's name in sacctmgr enforce PreserveCaseUser.
 -- When adding a coordinator or user that was once deleted enforce
    PreserveCaseUser.
 -- Correctly handle scenarios where a partitions MaxMemPerCPU is less than
    a jobs --mem-per-cpu and also -c is greater than 1.
 -- Set AccrueTime correctly when MaxJobsAccrue is disabled and BeginTime has
    not been established.
 -- Correctly account for job arrays for new {Max/Grp}JobsAccrue limits.

* Changes in Slurm 18.08.1
==========================
 -- Remove commented-out parts of man pages related to cons_tres work in 19.05,
    as these were showing up on the web version due to a syntax error.
 -- Prevent slurmctld performance issues in main background loop if multiple
    backup controllers are unavailable.
 -- Add missing user read association lock in burst_buffer/cray during init().
 -- Fix incorrect spacing for PartitionName lines in 'scontrol write config'.
 -- Fix creation of step hwloc xml file for after cpuset cgroup has been
    created.
 -- Add userspace as a valid default governor.
 -- Add timers to group_cache_lookup so if going slow advise
    LaunchParameters=send_gids.
 -- Fix SLURM_STEP_GRES=none to work correctly.
 -- Fix potential memory leak when a failure happens unpacking a ctld_multi_msg.
 -- Fix potential double free when a faulure happens when unpacking a
    node_registration_status_msg.
 -- Fix sacctmgr show runaways.
 -- Removed non-POSIX append operator from configure script for non-bash
    support.
 -- Fix incorrect spacing for PartitionName lines in 'scontrol write config'.
 -- Fix sacct to not print huge reserve times when the job was never eligible.
 -- burst_buffer/cray - Add missing locks around assoc_mgr when timing out a
    burst buffer.
 -- burst_buffer/cray - Update burst buffers when an association or qos
    is removed from the system.
 -- Remove documentation for deprecated Cray/ALPS systems. Please switch to
    Native Cray mode instead.
 -- Completely copy features when copying the list in the slurmctld.
 -- PMIX - Fix issue with packing processes when using an arbitrary task
    distribution.
 -- Fix hostlists to be able to handle nodenames with '-' in them surrounded
    by integers.
 -- Added sort option to sprio output.
 -- Fix correct job CPU count allocated.
 -- Fix sacctmgr setting GrpJobs limit when setting GrpJobsAccrue limit.
 -- Change the defaults to MemLimitEnforce=no and NoOverMemoryKill
    (See RELEASE_NOTES).
 -- Prevent abort when using Cray node features plugin on non-knl.
 -- Add ability to reboot down nodes with scontrol reboot_nodes.
 -- Protect against sending to the slurmdbd if the connection has gone away.
 -- Fix invalid read when not using backup slurmctlds.
 -- Prevent acct coordinators from changing default acct on add user.
 -- Don't allow scontrol top do modify job priorities when priority == 1.
 -- slurmsmwd - change parsing code to handle systems with the svid or inst
    fields set in xtconsumer output.
 -- Fix infinite loop in slurmctld if GRES is specified without a count.
 -- sacct: Print error when unknown arguments are found.
 -- Fix checking missing return codes when unpacking structures.
 -- Fix slurm.spec-legacy including slurmsmwd
 -- More explicit error message when cgroup oom-kill events detected.
 -- When updating an association and are unable to find parent association
    initialize old fairshare association pointer correctly.
 -- Wrap slurm_cond_signal() calls with mutexes where needed.
 -- Fix correct timeout with resends in slurm_send_only_node_msg.
 -- Fix pam_slurm_adopt to honor action_adopt_failure.
 -- Have the slurmd recreate the hwloc xml file for the full system on restart.
 -- sdiag - correct the units for the gettimeofday() stat to microseconds.
 -- Set SLURM_CLUSTER_NAME environment variable in MailProg to the ClusterName.
 -- smail - use SLURM_CLUSTER_NAME environment variable.
 -- job_submit/lua - expose argc/argv options through lua interface.
 -- slurmdbd - prevent false-positive warning about innodb settings having
    been set too low if they're actually set over 2GB.

* Changes in Slurm 18.08.0
==========================
 -- Fix segfault on job arrays when starting controller without dbd up.
 -- Fix pmi2 to build with gcc 8.0+.
 -- Remove the development snapshot of select/cons_tres plugin.
 -- Fix slurmd -C to not print benign error from xcpuinfo.
 -- Fix potential double locks in the assoc_mgr.
 -- Fix sacct truncate flag behavior Truncated pending jobs will always
    return a start and end time set to the window end time, so elapsed
    time is 0.
 -- Fix extern step hanging forever when canceled right after creation.
 -- sdiag - add slurmctld agent count.
 -- Remove requirement to have cgroup_allowed_devices_file.conf in order to
    constrain devices. By default all devices are allowed and GRES, that are
    associated with a device file, that are not requested are restricted.
 -- Fix proper alignment of clauses when determining if more nodes are needed
    for an allocation.
 -- Fix race condition when canceling a federation job that just started
    running.
 -- Prevent extra resources from being allocated when combining certain flags.
 -- Fix problem in task/affinity plugin that can lead to slurmd fatal()'ing
    when using --hint=nomultithread.
 -- Fix left over socket file when step is ending and using pmi2 with
    %n or %h in the spool dir.
 -- Don't remove hwloc full system xml file when shutting down the slurmd.
 -- Fix segfault that could happen with a het job when it was canceled while
    starting.
 -- Fix scan-build false-positive warning about invalid memory access in the
    _ping_controller() function.
 -- Add control_inx value to trigger_info_msg_t to permit future work in the
    trigger management code to distinguish which of multiple backup controllers
    has changed state.

* Changes in Slurm 18.08.0rc1
==============================
 -- Add TimelimitRaw sacct output field to display timelimit numbers.
 -- Fix job array preemption during backfill scheduling.
 -- Fix scontrol -o show assoc output.
 -- Add support for sacct --whole-hetjob=[yes|no] option.
 -- Make salloc handle node requests the same as sbatch.
 -- Add shutdown_on_reboot SlurmdParameter to control whether the Slurmd will
    shutdown itself down or not when a reboot request is received.
 -- Add cancel_reboot scontrol option to cancel pending reboot of nodes.
 -- Make Users case insensitive in the database based on
    Parameters=PreserveCaseUser in the slurmdbd.conf.
 -- Improve scheduling when dealing with node_features that could have a
    boot delay.
 -- Fix issue if a step launch fails we don't get a bunch of '(null)' strings
    in the step record for usage.
 -- Changed the default AuthType for slurmdbd to auth/munge.
 -- Make it so libpmi.so doesn't link to libslurm.so.$apiversion.
 -- Added 'remote-fs.target' to After directive of slurmd.service file.
 -- Fix filetxt plugin to handle it when you aren't running a jobacct_gather
    plugin.
 -- Remove drain on node when reboot nextstate used.
 -- Speed up pack of job's qos.
 -- Fix race condition when trying to update reservation in the database.
 -- For the PrologFlags slurm.conf option, make NoHold mutually exclusive with
    Contain and/or X11 options.
 -- Revise the handling of SlurmctldSyslogLevel and SlurmdSyslogLevel options
    in slurm.conf and DebugLevelSyslog in slurmdbd.conf.
 -- Gate reading the cgroup.conf file.
 -- Gate reading the acct_gather_* plugins.
 -- Add sacctmgr options to prevent/manage job queue stuffing:
    - GrpJobsAccrue=<max_jobs>
      Maximum number of pending jobs in aggregate able to accrue age priority
      for this association and all associations which are children of this
      association. To clear a previously set value use the modify command with
      a new value of -1.
    - MaxJobsAccrue=<max_jobs>
      Maximum number of pending jobs able to accrue age priority at any given
      time for the given association. This is overridden if set directly on a
      user. Default is the cluster's limit. To clear a previously set value use
      the modify command with a new value of -1.
    - MinPrioThreshold
      Minimum priority required to reserve resources when scheduling.

* Changes in Slurm 18.08.0pre2
==============================
 -- Remove support for "ChosLoc" configuration parameter.
 -- Configuration parameters "ControlMachine", "ControlAddr", "BackupController"
    and "BackupAddr" replaced by an ordered list of "SlurmctldHost" records
    with the optional address appended to the name enclosed in parenthesis.
    For example: "SlurmctldHost=head(12.34.56.78)". An arbitrary number of
    backup servers can be configured.
 -- When a pending job's state includes "UnavailableNodes" do not include the
    nodes in FUTURE state.
 -- Remove --immediate option from sbatch.
 -- Add infrastructure for per-job and per-step TRES parameters: tres-per-job,
    tres-per-node, tres-per-socket, tres-per-task, cpus-per-tres, mem-per-tres,
    tres-bind and tres-freq. These new parameters are not currently used, but
    have been added to the appropriate RPCs.
 -- Add DefCpuPerGpu and DefMemPerGpu to global and per-partition configuration
    parameters. Shown in scontrol/sview as "JobDefaults=...". NOTE: These
    options are for future use and currently have no effect.
 -- Fix for setting always the correct status on job update in mysql
 -- Add ValidateMode configuration parameter to knl_cray.conf for static
    MCDRAM/NUMA configurations.
 -- Fix security issue in accounting_storage/mysql plugin by always escaping
    strings within the slurmdbd. CVE-2018-7033.
 -- Disable local PTY output processing when using 'srun --unbuffered'. This
    prevents the PTY subsystem from inserting extraneous \r characters into
    the output stream.
 -- Change the column name for the %U (User ID) field in squeue to 'UID'.
 -- CRAY - Add CheckGhalQuiesce to the CommunicationParameters.
 -- When a process is core dumping, avoid terminating other processes in that
    task group. This fixes a problem with writing out incomplete OpenMP core
    files.
 -- CPU frequency management enhancements: If scaling_available_frequencies
    file is not available, then derive values from scaling_min_freq and
    scaling_max_freq values. If cpuinfo_cur_freq file is not available then
    try to use scaling_cur_freq.
 -- Add pending jobs count to sdiag output.
 -- Fix update job function. There were some incosistencies on the behavior
    that caused time limits to be modified when swapping QOS, bad permissions
    check for a coordinator and AllowQOS and DenyQOS were not enforced on
    job update.
 -- Add configuration paramerers SlurmctldPrimaryOnProg and
    SlurmctldPrimaryOffProg, which define programs to execute when a slurmctld
    daemon becomes the primary server or goes from primary to backup mode.
 -- Add configuration paramerers SlurmctldAddr for use with virtual IP to manage
    backup slurmctld daemons.
 -- Explicitly shutdown the slurmd process when instructed to reboot.
 -- Add ability to create/update partition with TRESBillingWeights through
    scontrol.
 -- Calcuate TRES billing values at submission so that billing limits can be
    enforced at submission with QOS DenyOnLimit.
 -- Add node_features plugin function "node_features_p_reboot_weight()" to
    return the node weight to be used for a compute node that requires reboot
    for use (e.g. to change the NUMA mode of a KNL node).
 -- Add NodeRebootWeight parameter to knl.conf configuration file.
 -- Fix insecure handling of job requested gid field. CVE-2018-10995.
 -- Fix srun to return highest signal of any task.
 -- Completely remove "gres" field from step record. Use "tres_per_node",
    "tres_per_socket", etc.
 -- Add "Links" parameter to gres.conf configuration file.
 -- Force slurm_mktime() to set tm_isdst to -1 so anyone using the function
    doesn't forget to set it.
 -- burst_buffer.conf - Add SetExecHost flag to enable burst buffer access
    from the login node for interactive jobs.
 -- Append ", with requeued tasks" to job array "end" emails if any tasks in the
    array were requeued. This is a hint to use "sacct --duplicates" to see the
    whole picture of the array job.
 -- Add ResumeFailProgram slurm.conf option to specify a program that is called
    when a node fails to respond by ResumeTimeout.
 -- Add new job pending reason of "ReqNodeNotAvail, reserved for maintenance".
 -- Remove AdminComment += syntax from 'scontrol update job'.
 -- sched/backfill: Reset job time limit if needed for deadline scheduling.
 -- For heterogeneous job component with required nodes, explicitly exclude
    those nodes from all other job components.
 -- Add name of partition used to output of srun --test-only output (valuable
    for jobs submitted to multiple partitions).
 -- If MailProg is not configured and "/bin/mail" (the default) does not exist,
    but "/usr/bin/mail" does exist then use "/usr/bin/mail" as a default value.
 -- sdiag output now reports outgoing slurmctld message queue contents.
 -- Fix issue in performance when reading slurm conf having nodes with features.
 -- Make it so the slurmdbd's pid file gets created before initing
    the database.
 -- Improve escaping special characters on user commands when specifying paths.
 -- Fix directory names with special char '\' that are not handled correctly.
 -- Add salloc/sbatch/srun option of --gres-flags=disable-binding to disable
    filtering of CPUs with respect to generic resource locality. This option is
    currently required to use more CPUs than are bound to a GRES (i.e. if a GPU
    is bound to the CPUs on one socket, but resources on more than one socket
    are required to run the job). This option may permit a job to be allocated
    resources sooner than otherwise possible, but may result in lower job
    performance.
 -- SlurmDBD - Print warning if MySQL/MariaDB internal tuning is not at least
    half of the recommended values.
 -- Move libpmi from src/api to contribs/pmi.
 -- Add ability to specify a node reason when rebooting nodes with "scontrol
    reboot".
 -- Add nextstate option to "scontrol reboot" to dictate state of node after
    reboot.
 -- Consider "resuming" (nextstate=resume) nodes as available in backfill
    future scheduling and don't replace "resuming" nodes in reservations.
 -- Add the use of a xml file to help performance when using hwloc.

* Changes in Slurm 18.08.0pre1
==============================
 -- Add new burst buffer state of "teardown-fail" to indicate the burst buffer
    teardown operation is failing on specific buffers. This changes the numeric
    value of the BB_STATE_COMPLETE type. Any Slurm version 17.02 or 17.11 tool
    used to report burst buffer state information will report a state of "66"
    rather than "complete" for burst buffers which have been deleted, but still
    exist in the slurmctld daemon's tables (a very short-lived situation).
 -- Multiple backup slurmctld daemons can be configured:
    * Specify "BackupController#=<hostname> and "BackupAddr#=<address>" to
      identify up to 9 backup servers.
    * Output format of "scontrol ping" and the daemon status at the end of
      "scontrol status" is modified to report up status of the primary and all
      backup servers.
    * "scontrol takeover [#]" command can now identify the SlurmctldHost
      index number. Default value is "1" (the first backup configured
      SlurmctldHost).
 -- Enable jobs with zero node count for creation and/or deletion of persistent
    burst buffers.
    * The partition default MinNodes configuration parameter is now 0
      (previously 1 node).
    * Zero size jobs disabled for job arrays and heterogeneous jobs, but
      supported for salloc, sbatch and srun commands.
 -- Add "scontrol show dwstat" command to display Cray burst buffer status.
 -- Add "GetSysStatus" option to burst_buffer.conf file. For burst_buffer/cray
    this would indicate the location of the "dwstat" command.
 -- Add node and partition configuration options of "CpuBind" to control default
    task binding. Modify the scontrol to report and modify these parameters.
 -- Add "NumaCpuBind" option to knl.conf file to automatically change a node's
    CpuBind parameter based upon changes to a node's NUMA mode.
 -- Add sbatch "--batch" option to identify features required on batch node.
    For example "sbatch --batch=haswell ...".
 -- Add "BatchFeatures" field to output of "scontrol show job".
 -- Add support for "--bb" option to sbatch command.
 -- Add new SystemComment field to job data structure and database. Currently
    used for Burst Buffer error logs.
 -- Expand reservation "flags" field from 32 to 64 bits.
 -- Add job state flag of "SIGNALING" to avoid race condition with multiple
    SIGSTOP/SIGCONT signals for the same job being active at the same time.
 -- Properly handle srun --will-run option when there are jobs in COMPLETING
    state.
 -- Properly report who is signaling a step.
 -- Don't combine updated reservation records in sreport's reservation report.
 -- node_features plugin - Add suport for XOR & XAND of job constraints (node
    feature specifications).
 -- Add support for parenthesis in a job's constraint specification to group
    like options together. For example
    --constraint="[(knl&snc4&flat)*4&haswell*1]" might be used to specify that
    four nodes with the features "knl", "snc4" and "flat" plus one node with
    the feature "haswell" are required.
 -- Improvements to how srun searches for the executible when using cwd.
 -- Now programs can be checked before execution if test_exec is set when using
    multi-prog option.
 -- Report NodeFeatures plugin configuration with scontrol and sview commands.
 -- Add acct_gather_profile/influxdb plugin.
 -- Add new job state of SO/STAGE_OUT indicating that burst buffer stage-out
    operation is in progress.
 -- Correct SLURM_NTASKS and SLURM_NPROCS environment variable for heterogeneous
    job step. Report values representing full allocation.
 -- Expand advanced reservation feature specification to support parenthesis and
    counts of nodes with specified features. Nodes with the feature currently
    active will be prefered.
 -- Defer job signaling until prolog is completed
 -- Have the primary slurmctld wait until the backup has completely shutdown
    before taking control.
 -- Fix issue where unpacking job state after TRES count changed could lead to
    invalid reads.
 -- Heterogeneous job steps allocations supported with
    * Open MPI (with Slurm's PMI2 and PMIx plugins) and
    * Intel MPI (with Slurm's PMI2 plugin)
 -- Remove redundant function arguments from task plugins:
    * Remove "job_id" field from task_p_slurmd_batch_request() function.
    * Remove "job_id" field from task_p_slurmd_launch_request() function.
    * Remove "job_id" field from task_p_slurmd_reserve_resources() function.
 -- Change function name from node_features_p_changible_feature() to
    node_features_p_changeable_feature in node_features plugin.
 -- Add Slurm configuration file check logic using "slurmctld -t" command.

* Changes in Slurm 17.11.14
===========================

* Changes in Slurm 17.11.13-2
=============================
 -- Fix Perl build for 32-bit systems.

* Changes in Slurm 17.11.13
===========================
 -- Add mitigation for a potential heap overflow on 32-bit systems in xmalloc.
    CVE-2019-6438.

* Changes in Slurm 17.11.12
===========================
 -- Fix regression in 17.11.10 that caused dbd messages to not be queued up
    when the dbd was down.

* Changes in Slurm 17.11.11
===========================
 -- Correctly initialize variable in env_array_user_default().
 -- Correctly handle scenarios where a partitions MaxMemPerCPU is less than
    a jobs --mem-per-cpu and also -c is greater than 1.

* Changes in Slurm 17.11.10
===========================
 -- Move priority_sort_part_tier from slurmctld to libslurm to make it possible
    to run the regression tests 24.* without changing that code since it links
    directly to the priority plugin where that function isn't defined.
 -- Fix issue where job time limits can increase to max walltime when updating
    a job with scontrol.
 -- Fix invalid protocol_version manipulation on big endian platforms causing
    srun and sattach to fail.
 -- Fix for QOS, Reservation and Alias env variables in srun.
 -- mpi/pmi2 - Backport 6a702158b49c4 from 18.08 to avoid dangerous detached
    thread.
 -- When allowing heterogeneous steps make sure we copy all the options to
    avoid copying strings that may be overwritten.
 -- Print correctly when sh5util finds and empty file.
 -- Fix sh5util to not seg fault on exit.
 -- Fix sh5util to check correctly for H5free_memory.
 -- Adjust OOM monitoring function in task/cgroup to prevent problems in
    regression suite from leaked file descriptors.
 -- Fix issue with gres when defined with a type and no count
    (i.e. gres=gpu/tesla) it would get a count of 0.
 -- Allow sstat to talk to slurmd's that are new in protocol version.
 -- Permit database names over 33 characters in accounting_storage/mysql.
 -- Fix negative values when profiling.
 -- Fix srun segfault caused by invalid memory reads on the env.
 -- Fix segfault on job arrays when starting controller without dbd up.
 -- Fix pmi2 to build with gcc 8.0+.
 -- Fix proper alignment of clauses when determining if more nodes are needed
    for an allocation.
 -- Fix race condition when canceling a federation job that just started
    running.
 -- Prevent extra resources from being allocated when combining certain flags.
 -- Fix problem in task/affinity plugin that can lead to slurmd fatal()'ing
    when using --hint=nomultithread.
 -- Fix left over socket file when step is ending and using pmi2 with
    %n or %h in the spool dir.
 -- Fix incorrect spacing for PartitionName lines in 'scontrol write config'.
 -- Fix sacct to not print huge reserve times when the job was never eligible.
 -- burst_buffer/cray - Add missing locks around assoc_mgr when timing out a
    burst buffer.
 -- burst_buffer/cray - Update burst buffers when an association or qos
    is removed from the system.
 -- If failed over to a backup controller, ensure the agent thread is launched
    to handle deferred tasks.
 -- Fix correct job CPU count allocated.
 -- Protect against sending to the slurmdbd if the connection has gone away.
 -- Fix checking missing return codes when unpacking structures.
 -- Fix slurm.spec-legacy including slurmsmwd
 -- More explicit error message when cgroup oom-kill events detected.
 -- When updating an association and are unable to find parent association
    initialize old fairshare association pointer correctly.
 -- Wrap slurm_cond_signal() calls with mutexes where needed.
 -- Fix correct timeout with resends in slurm_send_only_node_msg.
 -- Fix pam_slurm_adopt to honor action_adopt_failure.
 -- job_submit/lua - expose argc/argv options through lua interface.

* Changes in Slurm 17.11.9-2
============================
 -- Fix printing of node state "drain + reboot" (and other node state flags).
 -- Fix invalid read (segfault) when sorting multi-partition jobs.
 -- Move several new error() messages to debug() to keep them out of users'
    srun output.

* Changes in Slurm 17.11.9
==========================
 -- Fix segfault in slurmctld when a job's node bitmap is NULL during a
    scheduling cycle.  Primarily caused by EnforcePartLimits=ALL.
 -- Remove erroneous unlock in acct_gather_energy/ipmi.
 -- Enable support for hwloc version 2.0.1.
 -- Fix 'srun -q' (--qos) option handling.
 -- Fix socket communication issue that can lead to lost task completition
    messages, which will cause a permanently stuck srun process.
 -- Handle creation of TMPDIR if environment variable is set or changed in
    a task prolog script.
 -- Avoid node layout fragmentation if running with a fixed CPU count but
    without Sockets and CoresPerSocket defined.
 -- burst_buffer/cray - Fix datawarp swap default pool overriding jobdw.
 -- Fix incorrect job priority assignment for multi-partition job with
    different PriorityTier settings on the partitions.
 -- Fix sinfo to print correct node state.

* Changes in Slurm 17.11.8
==========================
 -- Fix incomplete RESPONSE_[RESOURCE|JOB_PACK]_ALLOCATION building path.
 -- Do not allocate nodes that were marked down due to the node not responding
    by ResumeTimeout.
 -- task/cray plugin - search for "mems" cgroup information in the file
    "cpuset.mems" then fall back to the file "mems".
 -- Fix ipmi profile debug uninitialized variable.
 -- Improve detection of Lua package on older RHEL distributions.
 -- PMIx: fixed the direct connect inline msg sending.
 -- MYSQL: Fix issue not handling all fields when loading an archive dump.
 -- Allow a job_submit plugin to change the admin_comment field during
    job_submit_plugin_modify().
 -- job_submit/lua - fix access into reservation table.
 -- MySQL - Prevent deadlock caused by archive logic locking reads.
 -- Don't enforce MaxQueryTimeRange when requesting specific jobs.
 -- Modify --test-only logic to properly support jobs submitted to more than
    one partition.
 -- Prevent slurmctld from abort when attempting to set non-existing
    qos as def_qos_id.
 -- Add new job dependency type of "afterburstbuffer". The pending job will be
    delayed until the first job completes execution and it's burst buffer
    stage-out is completed.
 -- Reorder proctrack/task plugin load in the slurmstepd to match that of slurmd
    and avoid race condition calling task before proctrack can introduce.
 -- Prevent reboot of a busy KNL node when requesting inactive features.
 -- Revert to previous behavior when requesting memory per cpu/node introduced
    in 17.11.7.
 -- Fix to reinitialize previously adjusted job members to their original value
    when validating the job memory in multi-partition requests.
 -- Fix _step_signal() from always returning SLURM_SUCCESS.
 -- Combine active and available node feature change logs on one line rather
    than one line per node for performance reasons.
 -- Prevent occasionally leaking freezer cgroups.
 -- Fix potential segfault when closing the mpi/pmi2 plugin.
 -- Fix issues with --exclusive=[user|mcs] to work correctly
    with preemption or when job requests a specific list of hosts.
 -- Make code compile with hdf5 1.10.2+
 -- mpi/pmix: Fixed the collectives canceling.
 -- SlurmDBD: improve error message handling on archive load failure.
 -- Fix incorrect locking when deleting reservations.
 -- Fix incorrect locking when setting up the power save module.
 -- Fix setting format output length for squeue when showing array jobs.
 -- Add xstrstr function.
 -- Fix printing out of --hint options in sbatch, salloc --help.
 -- Prevent possible divide by zero in _validate_time_limit().
 -- Add Delegate=yes to the slurmd.service file to prevent systemd from
    interfering with the jobs' cgroup hierarchies.
 -- Change the backlog argument to the listen() syscall within srun to 4096
    to match elsewhere in the code, and avoid communication problems at scale.

* Changes in Slurm 17.11.7
==========================
 -- Fix for possible slurmctld daemon abort with NULL pointer.
 -- Fix different issues when requesting memory per cpu/node.
 -- PMIx - override default paths at configure time if --with-pmix is used.
 -- Have sprio display jobs before eligible time when
    PriorityFlags=ACCRUE_ALWAYS is set.
 -- Make sure locks are always in place when calling _post_qos_list().
 -- Notify srun and ctld when unkillable stepd exits.
 -- Fix slurmstepd deadlock in stepd cleanup caused by race condition in
    the jobacct_gather fini() interfaces introduced in 17.11.6.
 -- Fix slurmstepd deadlock in PMIx startup.
 -- task/cgroup - fix invalid free() if the hwloc library does not return a
    string as expected.
 -- Fix insecure handling of job requested gid field. CVE-2018-10995.
 -- Add --without x11 option to rpmbuild in slurm.spec.

* Changes in Slurm 17.11.6
==========================
 -- CRAY - Add slurmsmwd to the contribs/cray dir.
 -- sview - fix crash when closing any search dialog.
 -- Fix initialization of variable in stepd when using native x11.
 -- Fix reading slurm_io_init_msg to handle partial messages.
 -- Fix scontrol create res segfault when wrong user/account parameters given.
 -- Fix documentation for sacct on parameter -X (--allocations)
 -- Change TRES Weights debug messages to debug3.
 -- FreeBSD - assorted fixes to restore build.
 -- Fix for not tracking environment variables from unrelated different jobs.
 -- PMIX - Added the direct connect authentication.
    When upgrading this may cause issues with jobs using pmix starting on mixed
    slurmstepd versions where some are less than 17.11.6.
 -- Prevent the backup slurmctld from losing the active/available node
    features list on takeover.
 -- Add documentation for fix IDLE*+POWER due to capmc stuck in Cray systems.
 -- Fix missing mutex unlock when prolog is failing on a node, leading to a
    hung slurmd.
 -- Fix locking around Cray CCM prolog/epilog.
 -- Add missing fed_mgr read locks.
 -- Fix issue incorrectly setting a job time_start to 0 while requeueing.
 -- smail - remove stray '-s' from mail subject line.
 -- srun - prevent segfault if ClusterName setting is unset but
    SLURM_WORKING_CLUSTER environment variable is defined.
 -- In configurator.html web pages change default configuration from
    task/none to task/affinity plugin and from select/linear plugin to
    select/cons_res plus CR_Core.
 -- Allow jobs to run beyond a FLEX reservation end time.
 -- Fix problem with wrongly set as Reservation job state_reason.
 -- Prevent bit_ffs() from returnig value out of bitmap range.
 -- Improve performance of 'squeue -u' when PrivateData=jobs is enabled.
 -- Make UnavailableNodes value in job reason be correct for each job.
 -- Fix 'squeue -o %s' on Cray systems.
 -- Fix incorrect error thrown when cancelling part of a job array.
 -- Fix error code and scheduling problem for --exclusive=[user|mcs].
 -- Fix build when lz4 is in a non-standard location.
 -- Be able to force power_down of cloud node even if in power_save state.
 -- Allow cloud nodes to be recognized in Slurm when booted out of band.
 -- Fixes race condition in _pack_job_gres() when is called multiple times.
 -- Increase duration of "sleep" command used to keep extern step alive.
 -- Remove unsafe usage of pthread_cancel in slurmstepd that can lead to
    to deadlock in glibc.
 -- Fix total TRES Billing on partitions.
 -- Don't tear down a BB if a node fails and --no-kill or resize of a job
    happens.
 -- Remove unsafe usage of pthread_cancel in pmix plugin that can lead to
    to deadlock in glibc.
 -- Fix fatal in controller when loading completed trigger
 -- Ignore reservation overlap at submission time.
 -- GRES type model and QOS limits documentation added
 -- slurmd - fix ABRT on SIGINT after reconfigure with MemSpecLimit set.
 -- PMIx - move two error messages on retry to debug level, and only display
    the error after the retry count has been exceeded.
 -- Increase number of tries when sending responses to srun.
 -- Fix checkpointing requeued/completing jobs in a bad state which caused a
    segfault on restart.
 -- Fix srun on ppc64 platforms.
 -- Prevent slurmd from starting steps if the Prolog returns an error when using
    PrologFlags=alloc.
 -- priority/multifactor - prevent segfault running sprio if a partition has
    just been deleted and PriorityFlags=CALCULATE_RUNNING is turned on.
 -- job_submit/lua - add ESLURM_INVALID_TIME_LIMIT return code value.
 -- job_submit/lua - print an error if the script calls log.user in
    job_modify() instead of returning it to the next submitted job erroneously.
 -- select/linear - handle job resize correctly.
 -- select/cons_res - improve handling of --cores-per-socket requests.

* Changes in Slurm 17.11.5
==========================
 -- Fix cloud nodes getting stuck in DOWN+POWER_UP+NO_RESPOND state after not
    responding by ResumeTimeout.
 -- Add job's array_task_cnt and user_name along with partitions
    [max|def]_mem_per_[cpu|node], max_cpus_per_node, and max_share with the
    SHARED_FORCE definition to the job_submit/lua plugin.
 -- srun - fix for SLURM_JOB_NUM_NODES env variable assignment.
 -- sacctmgr - fix runaway jobs identification.
 -- Fix for setting always the correct status on job update in mysql.
 -- Fix issue if running with an association manager cache (slurmdbd was down
    when slurmctld was started) you could loose QOS usage information.
 -- CRAY - Fix spec file to work correctly.
 -- Set scontrol exit code to 1 if attempting to update a node state to DRAIN
    or DOWN without specifying a reason.
 -- Fix race condition when running with an association manager cache
    (slurmdbd was down when slurmctld was started).
 -- Print out missing SLURM_PERSIST_INIT slurmdbd message type.
 -- Fix two build errors related to use of the O_CLOEXEC flag with older glibc.
 -- Add Google Cloud Platform integration scripts into contribs directory.
 -- Fix minor potential memory leak in backfill plugin.
 -- Add missing node flags (maint/power/etc) to node states.
 -- Fix issue where job time limits may end up at 1 minute when using the
    NoReserve flag on their QOS.
 -- Fix security issue in accounting_storage/mysql plugin by always escaping
    strings within the slurmdbd. CVE-2018-7033.
 -- Soften messages about best_fit topology to debug2 to avoid alarm.
 -- Fix issue in sreport reservation utilization report to handle more
    allocated time than 100% (Flex reservations).
 -- When a job is requesting a Flex reservation prefer the reservation's nodes
    over any other nodes.

* Changes in Slurm 17.11.4
==========================
 -- Add fatal_abort() function to be able to get core dumps if we hit an
    "impossible" edge case.
 -- Link slurmd against all libraries that slurmstepd links to.
 -- Fix limits enforce order when they're set at partition and other levels.
 -- Add slurm_load_single_node() function to the Perl API.
 -- slurm.spec - change dependency for --with lua to use pkgconfig.
 -- Fix small memory leaks in node_features plugins on reconfigure.
 -- slurmdbd - only permit requests to update resources from operators or
    administrators.
 -- Fix handling of partial writes in io_init_msg_write_to_fd() which can
    lead to job step launch failure under higher cluster loads.
 -- MYSQL - Fix to handle quotes in a given work_dir of a job.
 -- sbcast - fix a race condition that leads to "Unspecified error".
 -- Log that support for the ChosLoc configuration parameter will end in Slurm
    version 18.08.
 -- Fix backfill performance issue where bf_min_prio_reserve was not respected.
 -- Fix MaxQueryTimeRange checks.
 -- Print MaxQueryTimeRange in "sacctmgr show config".
 -- Correctly check return codes when creating a step to check if needing to
    wait to retry or not.
 -- Fix issue where a job could be denied by Reason=MaxMemPerLimit when not
    requesting any tasks.
 -- In perl tools, fix for regexp that caused extra incorrectly shown results.
 -- Add some extra locks in fed_mgr to be extra safe.
 -- Minor memory leak fixes in the fed_mgr on slurmctld shutdown.
 -- Make sreport job reports also report duplicate jobs correctly.
 -- Fix issues restoring certain Partition configuration elements, especially
    when ReconfigFlags=KeepPartInfo is enabled.
 -- Don't add TRES whose value is NO_VAL64 when building string line.
 -- Fix removing array jobs from hash in slurmctld.
 -- Print out missing user messages from jobsubmit plugin when srun/salloc are
    waiting for an allocation.
 -- Handle --clusters=all as case insensitive.
 -- Only check requested clusters in federation when using --test-only
    submission option.
 -- In the federation, make it so you can cancel stranded sibling jobs.
 -- Silence an error from PSS memory stat collection process.
 -- Requeue jobs allocated to nodes requested to DRAIN or FAIL if nodes are
    POWER_SAVE or POWER_UP, preventing jobs to start on NHC-failed nodes.
 -- Make MAINT and OVERLAP resvervation flags order agnostic on overlap test.
 -- Preserve node features when slurmctld daemons reconfigured including active
    and available KNL features.
 -- Prevent creation of multiple io_timeout threads within srun, which can
    lead to fatal() messages when those unexpected and additional mutexes are
    destroyed when srun shuts down.
 -- burst_buffer/cray - Prevent use of "#DW create_persistent" and
    "#DW destroy_persistent" directives available in Cray CLE6.0UP06. This
    will be supported in Slurm version 18.08. Use "#BB" directives until then.
 -- Fix task/cgroup affinity to behave correctly.
 -- FreeBSD - fix build on systems built with WITHOUT_KERBEROS.
 -- Fix to restore pn_min_memory calculated result to correctly enforce
    MaxMemPerCPU setting on a partition when the job uses --mem.
 -- slurmdbd - prevent infinite loop if a QOS is set to preempt itself.
 -- Fix issue with log rotation for slurmstepd processes.

* Changes in Slurm 17.11.3-2
==========================
 -- Revert node_features changes in 17.11.3 that lead to various segfaults on
    slurmctld startup.

* Changes in Slurm 17.11.3
==========================
 -- Send SIG_UME correctly to a step.
 -- Sort sreport's reservation report by cluster, time_start, resv_name instead
    of cluster, resv_name, time_start.
 -- Avoid setting node in COMPLETING state indefinitely if the job initiating
    the node reboot is cancelled while the reboot in in progress.
 -- Scheduling fix for changing node features without any NodeFeatures plugins.
 -- Improve logic when summarizing job arrays mail notifications.
 -- Add scontrol -F/--future option to display nodes in FUTURE state.
 -- Fix REASONABLE_BUF_SIZE to actually be 3/4 of MAX_BUF_SIZE.
 -- When a job array is preempting make it so tasks in the array don't wait
    to preempt other possible jobs.